The Pentagon's spy unit has quietly begun to rebuild a database for tracking potential terrorist threats that was shut down after it emerged that it had been collecting information on American anti-war activists.

The Defense Intelligence Agency filed notice this week that it plans to create a new section called Foreign Intelligence and Counterintelligence Operation Records, whose purpose will be to "document intelligence, counterintelligence, counterterrorism and counternarcotic operations relating to the protection of national security."

But while the unit's name refers to "foreign intelligence," civil liberties advocates and the Pentagon's own description of the program suggest that Americans will likely be included in the new database.